Apparatus for examining condition of the lungs and heart.



No. 654,906. Patented Iuly 3|, I900. D. B. MARSH.

APPARATUS FDR EXAMINING CONDITION OF THE LUNGS AND HEART.

(Application filed Nov. 11, 1897. Renewed Nov. 24, 1899.] (No Model.)

m: uonms PETERS cu. Pumoumu. WASHING UNITED STATES PATENT OFFICE.

DANIEL BRAND MARSH, OF BLAOKHEATI-I, CANADA.

APPARATUS FOR EXAMINING CONDITION OF THE LUNGS AND HEART.

SPECIFICATION forming part of Letters Patent No. 654,906, dated July 31,1900. Application filed November 11, 1897. Renewed November 24, 1899.derialNo. 738,229. (No model.)

To aZZ whom it may concern.-

Be it known that I, DANIEL BRAND MARSH, a citizen of the Dominion ofCanada, residing at Blackheath, in the county of Wentworth, in theProvince of Ontario, Canada, have invented a certain new and usefulImprovement in Apparatus for Examining the Condition of the Heart,Lungs, &c.; and I do hereby declare that the following is a full, clear,and exact description of the construction and operation of the same.

The invention relates to a further improvement on the apparatus forexamining the condition of the heart, lungs, &c., for which LettersPatent of the United States were granted to me on the 19th day ofOctober, 1897, under No. 592,154.

The present improvement consists in ventilating the cavity between thedisk and the diaphragm by openings in the disk and pivoting over theopenings a circular movable index-plate having an opening or openings inits face to register alternately with the opening or openings in thedisk and an indexfinger attached to the plate to point to letters cut onthe margin of the large disk. The letters are L, S, and W, whichrepresent the degrees of sound, as L for loud, S for soft, and W forweak.

Reference being made to the accompanying drawings, Figure 1 represents aplan of the large metallic disk. Fig. 2 represents a plan of theindex-plate detached. Fig. 3 represents a plan view of disk withindex-plate and finger attached thereto. Fig. 4 is a side view of theentire instrument.

A is the metallic disk; B, the central opening for the rubber ear-tubeconnection; a, the small air-opening in the disk A near the centralopening; I), the larger opening in the disk A a short distance from thesmaller one a; O, the index-plate pivoted to the disk A by a screw cland having an opening 6 through it, so as to register with both theopenings at I) in the said disk A.

fis the index-finger, attached to the indexplate O and is used forturning the plate and pointing to the letters L, S, and W, as desired.

The operation of the device is as follows: When the index plate O ispointing to the letter L and not registering with the openings at b inthe disk A, there is no ventilation in the cavity formed between thediaphragm h and the metallic disk A, the sound is strong and loud, andthe Vibrations full when the ear-tips g are placed in the ears of theoperator. TVhen the index-plate O is turned so that the opening 6 in itis registering with the small opening a in the metallic plate A and theindex-finger f pointing to the letter S, then the sounds to theoperators car are softer. When the index-plate O is turned farther on,so that the finger f points to the letter W and the opening e in saidplate registers with the larger opening I) in the disk A, the sounds areweaker and so indicated by the letter W, which means weaker.

The above-mentioned improvement ren= ders my first device more perfect,and under certain circumstances is very convenient to an operator whenexamining the condition of the heart, lungs, &c., in patients or others.

What I claim, and desire to secure by Letters Patent, is

In combination with an apparatus for ex amining the condition of theheart, lungs, &c., an index-plate, pivoted to the metallic disk andprovided with an opening in the plate to register with the openings ofdiffer ent sizes in the disk underneath, and an indeX-finger attached tothe index-plate to point to one of the letters L, S, and W, formed onthe margin of the disk, indicating the vibrations to be low, soft orweak as desired, substantially as specified.

Hamilton, Ontario, Canada, November 1,

DANIEL BRAND MARSH. In presence of- PERCY WEBBEB, WM. BRUCE.

